The Bat Falcon looks very similar to the larger Orange-breasted Falcon.
However, the Orange-breasted Falcon has an unusually large beak, usually a more fierce expression and its primaries just pass the tip of the tail whereas the primaries of the Bat Falcon do not reach the tip of the tail.

This is an immature because the undertail-coverts are barred.

Montezuma Lodge area, Parque Nacional Tatamá, Risaraldas, Colombia, 28 June 2015